with tens of thousands still suffering from super storm sandy, a volunteer army pitches in to help. our tony guida watches them at work. >> i'm astound by the response from new york. >> axelrod: challenges facing china's new leaders. bill whitaker shows us just how far the country has come in a single generation. and take a look at the latest muscle car. you won't believe whose muscle created it. priya clemens introduces us to the design team. captioning sponsored by cbs this is the "cbs evening news." >> axelrod: good evening. i'm jim axelrod. we are learning more tonight about the investigation that led to the abrupt resignation of c.i.a. chief and retired four-star general david petraeus. petraeus admitted to an affair and submitted his resignation to president obama, and now it turns out, it was the f.b.i. that discovered the relationship was with his biographer. homeland security correspondent bob orr is standing by in washington tonight. good evening, bob. >> reporter: good evening, jim. well, david petraeus is one of america's most decorated and reveered generals. as head of